Which GOG downloader version are you using? Additionally, could You post here a content of log file?

i am using the stable version 3.2.14

where i can find the log file?

Windows 7/Vista - C:\Users\USERNAME\AppData\Local\GOG.com
Windows XP - C:\Documents and Settings\USERNAME\Local Settings\Application Data\GOG.com
Mac OS X - Contents from the Console app regarding the GOG Downloader

That's where you'll find the log.

Had a problem with one installer not working due to the downloader still messing with it even after done downloader. After clearing the download from the thing the installer just vanished. After downloading another game and clearing the thing the GOG downloader got an error and shut down.

InvalidOperationException on Downloader 1
Message: Could not find file 'C:\Users\USER\Documents\GOG.com Downloads\icewind_dale_complete\setup_icewind_dale_complete.exe'.
Stack trace: at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
at GOGCompanionApp.Worker.DownloadChunk(Object downloadObject) in C:\bp\TEMP\GOG.com Companion\Worker.cs:line 1868
Inner exception:
Invalid checksum on chunk setup_icewind_dale_complete.exe.151
Chunk checksum: 0f045f78d638104c569f49f10814ed01
File checksum:
IOException on Downloader 1
Message: Could not find file 'C:\Users\USER\Documents\GOG.com Downloads\icewind_dale_complete\setup_icewind_dale_complete.exe'.
Stack trace: at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileInfo.get_Length()
at GOGCompanionApp.Worker.DownloadChunk(Object downloadObject) in C:\bp\TEMP\GOG.com Companion\Worker.cs:line 1937

Started downloading info: rayman_forever
Worker -1 Requesting https://api.gog.com/en/downloader2/game/rayman_forever/
Worker -1 Request https://api.gog.com/en/downloader2/game/rayman_forever/ successed?:True
Rayman® Forever info fetched
ended downloading info
fetching download sizes and chunk info for Rayman® Forever
Worker -1 Requesting https://api.gog.com/en/downloader2/file/rayman_forever/1_installer_0
Worker -1 Request https://api.gog.com/en/downloader2/file/rayman_forever/1_installer_0 successed?:True
Worker -1 Requesting https://api.gog.com/en/downloader2/installer/rayman_forever/1_installer_0/crc/
Worker -1 Request https://api.gog.com/en/downloader2/installer/rayman_forever/1_installer_0/crc/ successed?:True

Downloader 0 Requesting https://api.gog.com/en/downloader2/file/rayman_forever/1_installer_0
Downloader 0 Request https://api.gog.com/en/downloader2/file/rayman_forever/1_installer_0 successed?:True
currentDownload.Escaped_title: rayman_forever fileNumber:1_installer_0
Downloading chunk setup_rayman_forever.exe.0 bytes range(0 - 10485759)
Downloading chunk setup_rayman_forever.exe.1 bytes range(10485760 - 20971519)
Downloading chunk setup_rayman_forever.exe.2 bytes range(20971520 - 31457279)
Chunk byte ranges for chunk setup_rayman_forever.exe.1 correct
Chunk byte ranges for chunk setup_rayman_forever.exe.2 correct
Chunk byte ranges for chunk setup_rayman_forever.exe.0 correct
Downloading chunk setup_rayman_forever.exe.4 bytes range(41943040 - 52428799)
Chunk byte ranges for chunk setup_rayman_forever.exe.4 correct
Downloading chunk setup_rayman_forever.exe.3 bytes range(31457280 - 41943039)
Chunk byte ranges for chunk setup_rayman_forever.exe.3 correct
Downloading chunk setup_rayman_forever.exe.6 bytes range(62914560 - 73400319)
M Chunk byte ranges for chunk setup_rayman_forever.exe.6 correct
Downloading chunk setup_rayman_forever.exe.5 bytes range(52428800 - 62914559)
Downloading chunk setup_rayman_forever.exe.7 bytes range(73400320 - 83886079)
Chunk byte ranges for chunk setup_rayman_forever.exe.5 correct
Downloading chunk setup_rayman_forever.exe.8 bytes range(83886080 - 91518272)
Chunk byte ranges for chunk setup_rayman_forever.exe.8 correct
Chunk byte ranges for chunk setup_rayman_forever.exe.7 correct
InvalidOperationException on Downloader 3
Message: The operation has timed out.
Stack trace: at System.Net.ConnectStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at GOGCompanionApp.Worker.DownloadChunk(Object downloadObject) in C:\bp\TEMP\GOG.com Companion\Worker.cs:line 1711
Inner exception:
InvalidOperationException on Downloader 0
Message: The operation has timed out.
Stack trace: at System.Net.ConnectStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at GOGCompanionApp.Worker.DownloadChunk(Object downloadObject) in C:\bp\TEMP\GOG.com Companion\Worker.cs:line 1711
Inner exception:
InvalidOperationException on Downloader 4
Message: The operation has timed out.
Stack trace: at System.Net.ConnectStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at GOGCompanionApp.Worker.DownloadChunk(Object downloadObject) in C:\bp\TEMP\GOG.com Companion\Worker.cs:line 1711
Inner exception:
InvalidOperationException on Downloader 2
Message: The operation has timed out.
Stack trace: at System.Net.ConnectStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at GOGCompanionApp.Worker.DownloadChunk(Object downloadObject) in C:\bp\TEMP\GOG.com Companion\Worker.cs:line 1711
Inner exception:
InvalidOperationException on Downloader 6
InvalidOperationException on Downloader 7
Message: The operation has timed out.
Message: The operation has timed out.
Stack trace: at System.Net.ConnectStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at GOGCompanionApp.Worker.DownloadChunk(Object downloadObject) in C:\bp\TEMP\GOG.com Companion\Worker.cs:line 1711
Inner exception:
Stack trace: at System.Net.ConnectStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at GOGCompanionApp.Worker.DownloadChunk(Object downloadObject) in C:\bp\TEMP\GOG.com Companion\Worker.cs:line 1711
Inner exception:
InvalidOperationException on Downloader 1
Message: The operation has timed out.
Stack trace: at System.Net.ConnectStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at GOGCompanionApp.Worker.DownloadChunk(Object downloadObject) in C:\bp\TEMP\GOG.com Companion\Worker.cs:line 1711
Inner exception:
Invalid checksum on chunk setup_rayman_forever.exe.3
Chunk checksum: a44ea54cb3dc2cf60e088a8cfa40c3a3
File checksum: a6b42d4da474c01d484f0cf50c9ca5a5
84467712 size on chunk setup_rayman_forever.exe.3
InvalidOperationException on Downloader 5
Message: The operation has timed out.
InvalidOperationException on Downloader 8
Message: The operation has timed out.
Stack trace: at System.Net.ConnectStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at GOGCompanionApp.Worker.DownloadChunk(Object downloadObject) in C:\bp\TEMP\GOG.com Companion\Worker.cs:line 1711
Inner exception:
Stack trace: at System.Net.ConnectStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at GOGCompanionApp.Worker.DownloadChunk(Object downloadObject) in C:\bp\TEMP\GOG.com Companion\Worker.cs:line 1711
Inner exception:
UNHANDLED ERROR!
Message: Exception has been thrown by the target of an invocation.
Stack trace: at System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
at System.Delegate.DynamicInvokeImpl(Object[] args)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
Inner exception: System.OverflowException: Value was either too large or too small for a UInt32.
at System.Convert.ToUInt32(Int32 value)
at Microsoft.WindowsAPICodePack.Taskbar.TaskbarManager.SetProgressValue(Int32 currentValue, Int32 maximumValue, Window window)
at GOGCompanionApp.SpeedOMeter.<>c__DisplayClass4.<timer_Elapsed>b__1() in C:\bp\TEMP\GOG.com Companion\SpeedOMeter.cs:line 85
Downloading chunk setup_rayman_forever.exe.1 bytes range(10485760 - 20971519)
Downloading chunk setup_rayman_forever.exe.3 bytes range(31457280 - 41943039)
Chunk byte ranges for chunk setup_rayman_forever.exe.1 correct
Downloading chunk setup_rayman_forever.exe.5 bytes range(52428800 - 62914559)
Chunk byte ranges for chunk setup_rayman_forever.exe.5 correct
Downloading chunk setup_rayman_forever.exe.4 bytes range(41943040 - 52428799)
Chunk byte ranges for chunk setup_rayman_forever.exe.4 correct
Chunk byte ranges for chunk setup_rayman_forever.exe.3 correct
Ended downloading chunk setup_rayman_forever.exe.3
Valid checksum on chunk setup_rayman_forever.exe.3
Downloading chunk setup_rayman_forever.exe.6 bytes range(62914560 - 73400319)
Chunk byte ranges for chunk setup_rayman_forever.exe.6 correct
Ended downloading chunk setup_rayman_forever.exe.0
Valid checksum on chunk setup_rayman_forever.exe.0
Downloading chunk setup_rayman_forever.exe.7 bytes range(73400320 - 83886079)
Chunk byte ranges for chunk setup_rayman_forever.exe.7 correct
Ended downloading chunk setup_rayman_forever.exe.4
Valid checksum on chunk setup_rayman_forever.exe.4
Downloading chunk setup_rayman_forever.exe.8 bytes range(83886080 - 91518272)
Chunk byte ranges for chunk setup_rayman_forever.exe.8 correct
Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
Worker -1 Request https://api.gog.com/en/downloader2/user/stable/ successed?:True
Ended downloading chunk setup_rayman_forever.exe.2
Valid checksum on chunk setup_rayman_forever.exe.2
Resetting cache
Cleaning completed download Rayman® Forever
Cleaning ended
Closing Downloader

The latest Beta (version 3.2.21)

System Info if needed:
PU with 4 core(s) found:
CPU0: 3410 MHz for Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz
CPU1: 3410 MHz for Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz
CPU2: 3410 MHz for Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz
CPU3: 3410 MHz for Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz
Memory: 17128517632
OS Version: Microsoft Windows NT 6.1.7601 Service Pack 1
Language: English (United States)

Worked now (somewhat). Although there's a problem with the progress bar showing 99% and never progresses. Installer seems to work fine since it passes integrity check twice (runs twice when I run it), and there's no bin file in the gog.com folder under local folder. Right-clicking and remove it (since the clear button never shows up) will remove the installer since the downloader seems to think it's still downloading. Pausing and resuming doesn't work, logging out and logging back doesn't work either. The thing goes away after logging out, closing the downloader, removing the log, and logging back in.

CPU with 4 core(s) found:
CPU0: 3410 MHz for Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz
CPU1: 3410 MHz for Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz
CPU2: 3410 MHz for Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz
CPU3: 3410 MHz for Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz
Memory: 17128517632
OS Version: Microsoft Windows NT 6.1.7601 Service Pack 1
Language: English (United States)

Ended downloading chunk setup_icewind_dale_complete.exe.150
Valid checksum on chunk setup_icewind_dale_complete.exe.150
Ended downloading chunk setup_icewind_dale_complete.exe.149
Valid checksum on chunk setup_icewind_dale_complete.exe.149
Ended downloading chunk setup_icewind_dale_complete.exe.151
Valid checksum on chunk setup_icewind_dale_complete.exe.151
Ended downloading chunk setup_icewind_dale_complete.exe.152
Valid checksum on chunk setup_icewind_dale_complete.exe.152
Ended downloading chunk setup_icewind_dale_complete.exe.153
Ended downloading chunk setup_icewind_dale_complete.exe.154
Valid checksum on chunk setup_icewind_dale_complete.exe.153
Valid checksum on chunk setup_icewind_dale_complete.exe.154
Resetting cache
Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
Worker -1 Request https://api.gog.com/en/downloader2/user/stable/ successed?:True
Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
Worker -1 Request https://api.gog.com/en/downloader2/user/stable/ successed?:True
Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
Worker -1 Request https://api.gog.com/en/downloader2/user/stable/ successed?:True
Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
Worker -1 Request https://api.gog.com/en/downloader2/user/stable/ successed?:True
Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
Worker -1 Request https://api.gog.com/en/downloader2/user/stable/ successed?:True
Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
Worker -1 Request https://api.gog.com/en/downloader2/user/stable/ successed?:True
Worker -1 Requesting https://api.gog.com/en/downloader2/status/beta/3.2.21
Worker -1 Request https://api.gog.com/en/downloader2/status/beta/3.2.21 successed?:True
Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
Worker -1 Request https://api.gog.com/en/downloader2/user/stable/ successed?:True
Worker -1 Requesting https://api.gog.com/en/downloader2/status/beta/3.2.21
Worker -1 Request https://api.gog.com/en/downloader2/status/beta/3.2.21 successed?:True

Derp. Edited that out.

I still have the problem that every time I type something into the password field, the Downloader crashes. Since I never got a answer to my PMs, I hope it's okay if I post the log file here.
OS is Windows 7 64bit.

Okay, I just saw, that the log file is much too long to post it here. Maybe you never got the PM because of that? But I didn't get any error warning that the PM is too long.

I tried to attach the file to the post now, I hope that works.

EDIT: Okay, it didn't. Any other way to get the log to you?

Pastebin?

I thought about just uploading it too, but then I thought that they probably wouldn't take the risk to download a random file - so I just send a support ticket, since I saw that you can attach files of any sort there.

This still happens a lot. I'm using version 3.2.22

I confirm , the issue.

I have been very patient , now it's start to be very annoying to get a stable working version ... all problems started more than three weeks.... I don't request a half solution...

For me the 3.2.22 version worked like miracle
I dowloaded 3 games with no problems.
Now I am testing it to the limits with a 6.5 GB download :)

ok i come back with some more infos ;

1 - the version 3.2.22 is stated as 3.2.14 in the list of programs installed ... ?!?
2 - as i said above when a file is stuck at 99% , it's due to a chunk which is corrupted (i looked the log file)
3 - the problem 2 / doesn't happends everytime , like said F242 we could d/l games without issue BUT the contrary seems true aswell. So to me , it's not a stable version..... there's still some issue

LOG

note : i downloaded twice pid : because the 1st time it failed .....